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https://phys.org/news/2019-10-scientists-lithium-sulfur-battery-production-future.html
https://www.cnn.com/2020/01/06/tech/lithium-sulfur-battery-scli-intl-scn/index.html
Seems promising, 4x extra energy density given in some presentations, I have only seen these in the news sites. No official publications that I have seen yet, so probably a long way off from being commercialized. Most recent breakthrough came from Monash University (Melbourne), however multiple barriers to mass production such as rapid degradation. Previous attempts to overtake lithium-ion batteries since the major breakthrough in 2009 have failed, so possibly another 10 years if the technology proves to survive long periods of time.
Solid State Batteries
Some info from here:
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